We also stayed at the Park Towers and liked it - gotta love using those Starwood points! It's attached to the Sheraton, has a great pool, etc. Four Seasons and Alvear Palace are more central.

Buenos Aires is simply a marvelous place to visit. We did a half day tour (probably on the hop on, hop off bus) as well as a tour out to see the river area outside of BA (Leslie recommended and we enjoyed it!). I was surprised by the Italian influences, along with German and Spanish.

What ever you do .. it's not the Falkland Islands, it's the Malvidas for them!! The war over the islands with the British is still alive and well within the BA population.